Ozzy is a full grown least weasel (Mustela nivalis). Ozzy is a rescue that was hand-raised, but generally weasels do not make good pets, and are illegal to own in many places. Least weasels in the wild can kill rabbits that are much bigger than they are, so imagine what one would do to your finger if it didn't know you. See more videos of Ozzy at his YouTube channel. -via Metafilter